Questions tagged [ac-dc]

Questions regarding the safe and effecient design and implementation of AC voltage to DC voltage supplies. Typically Mains to some lower DC voltage.

43 questions with no upvoted or accepted answers
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15 views

61000-3-2 Pre-compliance harmonics

I am wondering about 61000-3-2 current harmonics pre-compliance test. Say a company designs a single-phase [up to 13A] power converter for low-line 115V and high-line 230V and pass 61000-3-2 pre-...
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4answers
236 views

How can I run my e-bike wheel on AC power?

I have an electric wheel designed for an electric bicycle conversion. By my understanding, the wheel is essentially a 48V, 1000w rated brushless DC motor. It comes with a thumb throttle and kill ...
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0answers
379 views

Reducing AC/DC adapter (SMPS) output voltage

I have a AC/DC adapter P-1650-22 (used to power a notebook) laying around. I would like to use it for other purposes, i.e. as a constant voltage source for LEDs. The problem is, that the output ...
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66 views

Help in identifying two parts

I need to identify two parts that I need to replace, but I'm having a hard time doing it. These are the parts: Part 1: From my research I think it is a trigger switch (http://www.jiaben.com/en/pro....
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177 views

Power supply unit with two negative and positive outputs

So I am trying to add a power supply unit, which takes one input and supposed to provide one output: IN: 85-265V AC OUT:12V DC; 25A (max output power 300W) However, when I look at it, it clearly ...
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97 views

How much energy is lost between (solar panels+battery pack) & DC operated electronics due to conversion

For the sake of simplicty; I have solar panels generating Xvolt, Yamperage. All of the power will be used by Xvolt devices. But all of the house and device adapters are designed to use AC grid. So ...
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0answers
171 views

How to force USB device to drain 500mA Current for charging?

I designed an AC-DC converter circuit(220VAC to 5VDC@700mA) to create a smart phone USB charger. The Transformer that I used in my design can supply only 700mA current. I searched the Web and ...
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0answers
739 views

12VAC to 12VDC Converter Requirements for RGB LED Controller

I have an outdoor lighting transformer (operating at the usual 12VAC) that I want to add a strip of LED lights in a new run. The transformer has two legs, each ...
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0answers
240 views

What controller for a 400W AC-DC SMPS?

I would like to build a big AC-DC SMPS. I built a little one based on ST's VIPer22A. This is a nice little IC that can give up to a couple watts (my design was 5V 1A). It was easy enough to design ...
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1answer
113 views

Can I build a laptop like power supply for my PC with a car battery?

Power outages are quite common here(india) and I want something better than a UPS: I don't wanna shut down the system. I was quiet inspired by Make Your Computer UPS Last for Hours that uses a car ...
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1answer
550 views

Why there are AC timing characteristics but not DC in I2C interfaced chip?

I'm quite newbie in electronics, and I'd like to learn why there are AC timing characteristics to this particular EEPROM (24LC512) that I'm using but none for DC? Does AC timing constraints apply to ...
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25 views

DC Coaxial Power Connector Rated for 20A

I have a 12V 20A power adapter seen here (https://www.ledwholesalers.com/v2/index.php?route=product/product&path=40_117&product_id=999). I would like to connect to this power supply, but my ...
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26 views

Redundant power supply out of two Recom RAC20-05SK

I know that there are plenty of questions regarding redundant power supplies, but mine is a little bit special: I am building an IoT Device running on 5V 4A DC and I am planning to use the Recom ...
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16 views

Webench coil selection for UCC28634DR AC-DC converter

I have being trying to design an AC-DC adapter for a freezer project I'm working with. After a couple of days researching I came across Texas Instruments Webench, which helped a lot. Although most of ...
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1answer
42 views

AC to DC conversion using without neutral

I have a project to replace my wall switch with my smart switch which can be controlled by ESP32. Needed to use AC to DC conversion to get 3.3V from 240V/50Hz. Some of the walls have only phase and ...
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29 views

Techniques for measuring the ripple current of SMD electrolytic capacitors

I am currently creating a test plan for an AC/DC converter (90VAC...264VAC -> 12VDC) I've been working on. Since the output electrolytic capacitors are of SMD type, I am trying to come up with ...
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21 views

where to find exact definition of i/p and o/p as used to define insulation resistance for AC DC converter?

Most AC DC converter datasheet use I/p and O/P to define insulation resistance I am looking for the exact definition of these parameters as used in this context ( I know their definition for ...
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1answer
62 views

What does it mean for a power supply to have an output range?

I had a power supply blow and I replaced it with one from the same company with the same model number. The new supply has lightly different specification than the old supply. Oddly (to me) it gives ...
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0answers
37 views

Need help wiring a power supply (UK)

First time here so apologies if this question is in the wrong place. Also i'm a bit of an amateur with this sort of things to go easy on me. I've bought a power supply to power a DC charger for LiPo ...
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30 views

Use old battery pack charger as DC power supply?

I have an old charger for NiCd battery packs. It is labeled with: Input: 230 V~, 50/60 Hz, 33 W Output: 4.8 - 12 V DC, 1.4 A I opened it and found a transformer and two circuit boards. I made a ...
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46 views

How to ground external AC voltage (18V) to Arduino?

I have a project where I need to read 0-18 Volts AC in Arduino's input (0-5V DC). So I did a circuit with a diode (half wave bridge), voltage divider, and a RC circuit where I tested some values for ...
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1answer
82 views

AC to DC conversion: is this an appropriate implementation?

I understand that a 20v AC converter supplies 20V RMS AC. I wish to convert this to 20v DC and so have drawn up a schematic for this which includes: the AC to DC conversion, regulation, smoothing, and ...
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1answer
46 views

Output current and voltage levels regulation in ac/dc adapter

On the picture below is the output circuit of AC/DC adapter. I understand how voltage level contol works, but I don't understand how exactly current limitation works and how should I calculate ...
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109 views

Flyback converter with dual outputs (12V / 5V)

I came across the following flyback converter circuit, which has a dual output (12V and 5V), but I am unable to figure out why the secondary windings are connected in series. Based on the datasheet ...
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0answers
57 views

Energy Meter power supply advice/help

I've been assigned to start working on a smart energy meter project, it's been like 10 years since I put any work in AC. I would be sincerely grateful for any constructive advice. Now the 3-phase ...
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1answer
74 views

How to choose AC/DC adapter - high voltage low current vs low voltage high current

I got an LED light kit, 2 lights, each takes 60W, at 12-30V. I'm planning to use these lights separately, and need to choose between: 12V, 5A adapter 24V, 2.5A adapter Both will give me 60W, but ...
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0answers
34 views

Can I use AC voltage from myRIO to power stepper motor?

I am using easydriver and arduino for a stepper motor provided on this website The motor is 17HS3401S Stepper Motor and I think this is the correct datasheet found on the internet for the same. ...
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0answers
45 views

Power Supply Design 230 AC to 80V DC - multisim and real components

I am an young student that was tasked to build a power supply which will convert single phase 230V AC into 80V DC to test specific DC motors (custom made). I only know that under normal operation and ...
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70 views

Why does rectifier output is showing DC instead of pulsating DC

I am using below circuit for PFC. Before connecting coupled inductor's auxiliary output to the IC's Vcc, I wanted to make sure that it is coming properly or not. So when I probed the red dot in the ...
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0answers
75 views

PFC boost converter is not stepping up the voltage

I am making a PFC circuit for AC-DC converter. I am facing a weird issue. As per my design the output of the circuit should be 390VDC, but I am getting 311VDCrms with ringing (overshoot 360V, ...
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87 views

Astable 555 used for AC to DC Halfwave to DC stable conversion, is what I have done correct?

I have this falstad-circuit: And here it is per request, as a SCH file screen: I'm trying to use a 555 astable to convert a variable AC with maximum of 12V (coming from Bicycle Hub) to 8VDC, ...
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129 views

Use Triac as SMPS to get DC voltage

I want n 12V 1A supply for a project. I want a transformer-less topology. I was reading and experimenting with readily available traic based dimmers. They use phase control to cut the input voltage ...
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0answers
44 views

SMPS topology for combination of current controlled rail and fixed voltage rail

I'm looking at designing a LED driving power supply that can interface with a universal AC main input (~90VAC-260VAC) and produce 2 rails at the output; one a current controlled rail, and the other a ...
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1answer
53 views

How to size transformer for a circuit?

I am using a 5 Watt PCB mount AC/DC power module with universal input(85-264 V) and output as 12 V. The cost of the module is very high so thought if we could replace the module with a PCB mount ...
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80 views

Fuses on both lines of an isolated AC/DC converter

I'm redesigning a board made from another person. This board have several AC/DC converters (like Traco TMP07 Series and similar) and some screw connectors to connect external devices. Neither the ...
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2answers
83 views

What is a Kva in simple terms, for somebody who doesn't know electrical engineering?

I have a DC circuit that runs on 8.1 A × 12 V (97.2 W). Power is supplied from a AC-DC transformer that plugs into a socket. How many of these can I run in a place that provides a maximum of three-...
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183 views

Need help selecting a transformer for an AC/DC converter

I'm working on a pinball project that requires a 50VDC voltage to drive solenoids. The biggest load comes from the flippers (which both could be activated simultaneously) however it's possible for ...
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1answer
84 views

DC signal to Integrated signal

I'm so new in analog electronics. So I stuck with one issue. Let's say I have an input signal, like blue one: To get a DC form I can rectife it (got a grip on it). But what I need is a smooth(...
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2answers
186 views

Power Supply for two 50V/12.5A Solenoids

I'm in the planning stages of building a custom pinball table and one of the sticking points is powering the flipper coils. They're 50V DC coils with a resistance of only 4 ohms during the stroke. ...
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1answer
52 views

Back Up Battery System Design

So I’m trying to design an AC/DC convertor for a test unit that will go inside of an environmental chamber, but I’m also trying to build in a battery backup charger and switcher circuit, in the event ...
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0answers
70 views

What external power supply should I use for Arduino modules?

I build a data logger with Arduino MEGA, SD, Ethernet, RTC, GSM, display module, and thermal printer. I am facing problem with unregulated power supplies. I have tried many power adapters, phone ...
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1answer
244 views

How do I choose appropriate fuse for my circuit?

I am currently using a AC-DC adaptor with specs: AC-I: 100-2040V~50/60Hz 1.6A DC-O: 12V 5A Which is powering up 8 DC motors, 4× 12V 6W 4× 12V (wattage not specified, the motor is meant to be ...
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1answer
73 views

What is the power consumption of a 12V adapter running 4 CPU fans?

I have a quick question here. I am not a ECE guy and just a hobbyist trying to tinker while quarantined. I have 4 CPU fans (120mm) laying around and I'm trying to re-purpose them as a small fan. ...